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<pre class="textdiagram" id="fig57">
+-----------+   +-----------+   +-----------+
|           |   |           |   |           |
|  Client   |   |  Client   |   |  Client   |
|           |   |           |   |           |
\-----------/   \-----------/   \-----------/
      ^               ^               ^
      |               |               |
      \---------------+---------------/
Titanic,              |         "Titanic,
give me coffee"       |          give me tea"
                      v                            Disk
                /-----------\     +---------+     +-------+
                |           |     |         |     |       |
                |  Broker   |<--->| Titanic |<--->|  {s}  |
                |           |     |         |     |       |
                \-----------/     +---------+     +-------+
                      ^
                      |
      /---------------+---------------\
      |               |               |
      v               v               v
/-----------\   /-----------\   /-----------\
|  "Water"  |   |   "Tea"   |   | "Coffee"  |
+-----------+   +-----------+   +-----------+
|           |   |           |   |           |
|  Worker   |   |  Worker   |   |  Worker   |
|           |   |           |   |           |
+-----------+   +-----------+   +-----------+
</pre>
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